Improvements to convoy dashboard last_activity column:
1. When issues have no assignee:
- Fall back to issue's updated_at timestamp
- Show age with "(unassigned)" suffix, e.g., "2m (unassigned)"
2. When issues have assignee but no active tmux session:
- Show "idle" instead of "no activity"
3. Added UpdatedAt field to track issue timestamps
This provides better context for convoys that haven't been assigned yet.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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